as defined by wisegeek.com, see www.wisegeek.com/what-is-japanese-anime.htm for details
An otaku REFUSES to have a job unless it involves some connection to anime. An otaku generally has no social life outside of anime as they will break up with any decent girl/boyfriend who is intolerant of their anime addiction. Also, most male otakus have a secret fetish of being female or are gay/bisexual.
Otakus can generally be identified by their suitcase-sized CD/DVD case, filled with 1000+ episodes of d- grade amine series. Naturally, the 1000+ blank disks they're burned on were stolen from dad or a friend, becuase the otaku won't even try to get a job.
Many otakus are now or have been homeless for a year or more, getting kicked out of everywhere every 2 weeks after they are caught stealing CD-R's to burn anime on.
Most are total losers who will never amount to anything more than a homeless statistic, welfare slob or "that kid down the block" who lives above his parent's garage.
Tom: "I'm such an otaku! I've got 2458 anime CD's now!"
Bill:"Otaku indeed! You're just a 11 year old moronic kid in a grown man's body!"